<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>实参与形参</title>
    <style>
        *{margin: 0;padding: 0;list-style-type: none;}
    </style>
</head>
<body>
    <script>
        // 函数的参数等同于变量) ==> 形参
        function fn(a,b){

        }
        //调用函数时定义的参数(值) ==> 实参
        fn(10,20)
    </script>
</body>
</html>